/*
 * jQuery OrgChart Plugin
 * https://github.com/dabeng/OrgChart
 *
 * Demos of jQuery OrgChart Plugin
 * http://dabeng.github.io/OrgChart/local-datasource/
 * http://dabeng.github.io/OrgChart/ajax-datasource/
 * http://dabeng.github.io/OrgChart/ondemand-loading-data/
 * http://dabeng.github.io/OrgChart/option-createNode/
 * http://dabeng.github.io/OrgChart/export-orgchart/
 * http://dabeng.github.io/OrgChart/integrate-map/
 *
 * Copyright 2016, dabeng
 * http://dabeng.github.io/
 *
 * Licensed under the MIT license:
 * http://www.opensource.org/licenses/MIT
 */
'use strict';

(function(factory) {
    if (typeof module === 'object' && typeof module.exports === 'object') {
        factory(require('jquery'), window, document);
    } else {
        factory(jQuery, window, document);
    }
}(function($, window, document, undefined) {
    $.fn.orgchart = function(options) {
        var defaultOptions = {
            'nodeTitle': 'name',
            'nodeId': 'id',
            'nodeChildren': 'children',
            'toggleSiblingsResp': false,
            'depth': 999,
            'chartClass': '',
            'exportButton': false,
            'exportFilename': 'OrgChart',
            'parentNodeSymbol': 'fa-users',
            'draggable': false,
            'direction': 't2b',
            'pan': false,
            'zoom': false
        };

        switch (options) {
            case 'buildHierarchy':
                return buildHierarchy.apply(this, Array.prototype.splice.call(arguments, 1));
            case 'addChildren':
                return addChildren.apply(this, Array.prototype.splice.call(arguments, 1));
            case 'addParent':
                return addParent.apply(this, Array.prototype.splice.call(arguments, 1));
            case 'addSiblings':
                return addSiblings.apply(this, Array.prototype.splice.call(arguments, 1));
            case 'removeNodes':
                return removeNodes.apply(this, Array.prototype.splice.call(arguments, 1));
            case 'getHierarchy':
                return getHierarchy.apply(this, Array.prototype.splice.call(arguments, 1));
            default: // initiation time
                var opts = $.extend(defaultOptions, options);
        }

        // build the org-chart
        var $chartContainer = this;
        var data = opts.data;
        var $chart = $('<div>', {
            'data': { 'options': opts },
            'class': 'orgchart' + (opts.chartClass !== '' ? ' ' + opts.chartClass : '') + (opts.direction !== 't2b' ? ' ' + opts.direction : ''),
            'click': function(event) {
                if (!$(event.target).closest('.node').length) {
                    $chart.find('.node.focused').removeClass('focused');
                }
            }
        });
        if ($.type(data) === 'object') {
            if (data instanceof $) { // ul datasource
                buildHierarchy($chart, buildJsonDS(data.children()), 0, opts);
            } else { // local json datasource
                buildHierarchy($chart, opts.ajaxURL ? data : attachRel(data, '00'), 0, opts);
            }
        } else {
            $.ajax({
                'url': data,
                'dataType': 'json',
                'beforeSend': function () {
                    $chart.append('<i class="fa fa-circle-o-notch fa-spin spinner"></i>');
                }
            })
                .done(function(data, textStatus, jqXHR) {
                    buildHierarchy($chart, opts.ajaxURL ? data : attachRel(data, '00'), 0, opts);
                })
                .fail(function(jqXHR, textStatus, errorThrown) {
                    console.log(errorThrown);
                })
                .always(function() {
                    $chart.children('.spinner').remove();
                });
        }
        $chartContainer.append($chart);

        // append the export button
        if (opts.exportButton && !$chartContainer.find('.oc-export-btn').length) {
            var $exportBtn = $('<button>', {
                'class': 'oc-export-btn' + (opts.chartClass !== '' ? ' ' + opts.chartClass : ''),
                'text': 'Export',
                'click': function() {
                    if ($(this).children('.spinner').length) {
                        return false;
                    }
                    var $mask = $chartContainer.find('.mask');
                    if (!$mask.length) {
                        $chartContainer.append('<div class="mask"><i class="fa fa-circle-o-notch fa-spin spinner"></i></div>');
                    } else {
                        $mask.removeClass('hidden');
                    }
                    var sourceChart = $chartContainer.addClass('canvasContainer').find('.orgchart:visible').get(0);
                    var flag = opts.direction === 'l2r' || opts.direction === 'r2l';
                    html2canvas(sourceChart, {
                        'width': flag ? sourceChart.clientHeight : sourceChart.clientWidth,
                        'height': flag ? sourceChart.clientWidth : sourceChart.clientHeight,
                        'onclone': function(cloneDoc) {
                            $(cloneDoc).find('.canvasContainer').css('overflow', 'visible')
                                .find('.orgchart:visible:first').css('transform', '');
                        },
                        'onrendered': function(canvas) {
                            $chartContainer.find('.mask').addClass('hidden')
                                .end().find('.oc-download-btn').attr('href', canvas.toDataURL())[0].click();
                        }
                    })
                        .then(function() {
                            $chartContainer.removeClass('canvasContainer');
                        }, function() {
                            $chartContainer.removeClass('canvasContainer');
                        });
                }
            });
            var downloadBtn = '<a class="oc-download-btn' + (opts.chartClass !== '' ? ' ' + opts.chartClass : '') + '"'
                + ' download="' + opts.exportFilename + '.png"></a>';
            $chartContainer.append($exportBtn).append(downloadBtn);
        }

        if (opts.pan) {
            $chartContainer.css('overflow', 'hidden');
            $chart.on('mousedown',function(e){
                var $this = $(this);
                if ($(e.target).closest('.node').length) {
                    $this.data('panning', false);
                    return;
                } else {
                    $this.css('cursor', 'move').data('panning', true);
                }
                var lastX = 0;
                var lastY = 0;
                var lastTf = $this.css('transform');
                if (lastTf !== 'none') {
                    var temp = lastTf.split(',');
                    if (lastTf.indexOf('3d') === -1) {
                        lastX = parseInt(temp[4]);
                        lastY = parseInt(temp[5]);
                    } else {
                        lastX = parseInt(temp[12]);
                        lastY = parseInt(temp[13]);
                    }
                }
                var startX = e.pageX - lastX;
                var startY = e.pageY - lastY;

                $(document).on('mousemove',function(ev) {
                    var newX = ev.pageX - startX;
                    var newY = ev.pageY - startY;
                    var lastTf = $this.css('transform');
                    if (lastTf === 'none') {
                        if (lastTf.indexOf('3d') === -1) {
                            $this.css('transform', 'matrix(1, 0, 0, 1, ' + newX + ', ' + newY + ')');
                        } else {
                            $this.css('transform', 'matrix3d(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, ' + newX + ', ' + newY + ', 0, 1)');
                        }
                    } else {
                        var matrix = lastTf.split(',');
                        if (lastTf.indexOf('3d') === -1) {
                            matrix[4] = ' ' + newX;
                            matrix[5] = ' ' + newY + ')';
                        } else {
                            matrix[12] = ' ' + newX;
                            matrix[13] = ' ' + newY;
                        }
                        $this.css('transform', matrix.join(','));
                    }
                });
            });
            $(document).on('mouseup',function() {
                if ($chart.data('panning')) {
                    $chart.css('cursor', 'default');
                    $(this).off('mousemove');
                }
            });
        }

        if (opts.zoom) {
            $chartContainer.on('wheel', function(event) {
                event.preventDefault();
                var lastTf = $chart.css('transform');
                var newScale  = 1 + (event.originalEvent.deltaY > 0 ? -0.2 : 0.2);
                if (lastTf === 'none') {
                    $chart.css('transform', 'scale(' + newScale + ',' + newScale + ')');
                } else {
                    if (lastTf.indexOf('3d') === -1) {
                        $chart.css('transform', lastTf + ' scale(' + newScale + ',' + newScale + ')');
                    } else {
                        $chart.css('transform', lastTf + ' scale3d(' + newScale + ',' + newScale + ', 1)');
                    }
                }
            });
        }

        return $chartContainer;
    };

    function buildJsonDS($li) {
        var subObj = {
            'name': $li.contents().eq(0).text().trim(),
            'relationship': ($li.parent().parent().is('li') ? '1': '0') + ($li.siblings('li').length ? 1: 0) + ($li.children('ul').length ? 1 : 0)
        };
        if ($li[0].id) {
            subObj.id = $li[0].id;
        }
        $li.children('ul').children().each(function() {
            if (!subObj.children) { subObj.children = []; }
            subObj.children.push(buildJsonDS($(this)));
        });
        return subObj;
    }

    function attachRel(data, flags) {
        data.relationship = flags + (data.children ? 1 : 0);
        if (data.children) {
            data.children.forEach(function(item) {
                attachRel(item, '1' + (data.children.length > 1 ? 1 :0));
            });
        }
        return data;
    }

    function loopChart($chart) {
        var $tr = $chart.find('tr:first');
        var subObj = { 'id': $tr.find('.node')[0].id };
        $tr.siblings(':last').children().each(function() {
            if (!subObj.children) { subObj.children = []; }
            subObj.children.push(loopChart($(this)));
        });
        return subObj;
    }

    function getHierarchy($chart) {
        var $chart = $chart || $(this).find('.orgchart');
        if (!$chart.find('.node:first')[0].id) {
            return 'Error: Nodes of orghcart to be exported must have id attribute!';
        }
        return loopChart($chart);
    }

    // detect the exist/display state of related node
    function getNodeState($node, relation) {
        var $target = {};
        if (relation === 'parent') {
            $target = $node.closest('table').closest('tr').siblings(':first').find('.node');
        } else if (relation === 'children') {
            $target = $node.closest('tr').siblings();
        } else {
            $target = $node.closest('table').parent().siblings();
        }
        if ($target.length) {
            if ($target.is(':visible')) {
                return {"exist": true, "visible": true};
            }
            return {"exist": true, "visible": false};
        }
        return {"exist": false, "visible": false};
    }

    // recursively hide the ancestor node and sibling nodes of the specified node
    function hideAncestorsSiblings($node) {
        var $temp = $node.closest('table').closest('tr').siblings();
        if ($temp.eq(0).find('.spinner').length) {
            $node.closest('.orgchart').data('inAjax', false);
        }
        // hide the sibling nodes
        if (getNodeState($node, 'siblings').visible) {
            hideSiblings($node);
        }
        // hide the lines
        var $lines = $temp.slice(1);
        $lines.css('visibility', 'hidden');
        // hide the superior nodes with transition
        var $parent = $temp.eq(0).find('.node');
        var grandfatherVisible = getNodeState($parent, 'parent').visible;
        if ($parent.length && $parent.is(':visible')) {
            $parent.addClass('slide slide-down').one('transitionend', function() {
                $parent.removeClass('slide');
                $lines.removeAttr('style');
                $temp.addClass('hidden');
            });
        }
        // if the current node has the parent node, hide it recursively
        if ($parent.length && grandfatherVisible) {
            hideAncestorsSiblings($parent);
        }
    }

    // show the parent node of the specified node
    function showParent($node) {
        // just show only one superior level
        var $temp = $node.closest('table').closest('tr').siblings().removeClass('hidden');
        // just show only one line
        $temp.eq(2).children().slice(1, -1).addClass('hidden');
        // show parent node with animation
        var parent = $temp.eq(0).find('.node')[0];
        repaint(parent);
        $(parent).addClass('slide').removeClass('slide-down').one('transitionend', function() {
            $(parent).removeClass('slide');
            if (isInAction($node)) {
                switchVerticalArrow($node.children('.topEdge'));
            }
        });
    }

    // recursively hide the descendant nodes of the specified node
    function hideDescendants($node) {
        var $temp = $node.closest('tr').siblings();
        if ($temp.last().find('.spinner').length) {
            $node.closest('.orgchart').data('inAjax', false);
        }
        var $visibleNodes = $temp.last().find('.node:visible');
        var $lines = $visibleNodes.closest('table').closest('tr').prevAll('.lines').css('visibility', 'hidden');
        $visibleNodes.addClass('slide slide-up').eq(0).one('transitionend', function() {
            $visibleNodes.removeClass('slide');
            $lines.removeAttr('style').addClass('hidden').siblings('.nodes').addClass('hidden');
            if (isInAction($node)) {
                switchVerticalArrow($node.children('.bottomEdge'));
            }
        });
    }

    // show the children nodes of the specified node
    function showDescendants($node) {
        var $descendants = $node.closest('tr').siblings().removeClass('hidden')
            .eq(2).children().find('tr:first').find('.node:visible');
        // the two following statements are used to enforce browser to repaint
        repaint($descendants.get(0));
        $descendants.addClass('slide').removeClass('slide-up').eq(0).one('transitionend', function() {
            $descendants.removeClass('slide');
            if (isInAction($node)) {
                switchVerticalArrow($node.children('.bottomEdge'));
            }
        });
    }

    // hide the sibling nodes of the specified node
    function hideSiblings($node, direction) {
        var $nodeContainer = $node.closest('table').parent();
        if ($nodeContainer.siblings().find('.spinner').length) {
            $node.closest('.orgchart').data('inAjax', false);
        }
        if (direction) {
            if (direction === 'left') {
                $nodeContainer.prevAll().find('.node:visible').addClass('slide slide-right');
            } else {
                $nodeContainer.nextAll().find('.node:visible').addClass('slide slide-left');
            }
        } else {
            $nodeContainer.prevAll().find('.node:visible').addClass('slide slide-right');
            $nodeContainer.nextAll().find('.node:visible').addClass('slide slide-left');
        }
        var $animatedNodes = $nodeContainer.siblings().find('.slide');
        var $lines = $animatedNodes.closest('.nodes').prevAll('.lines').css('visibility', 'hidden');
        $animatedNodes.eq(0).one('transitionend', function() {
            $lines.removeAttr('style');
            var $siblings = direction ? (direction === 'left' ? $nodeContainer.prevAll(':not(.hidden)') : $nodeContainer.nextAll(':not(.hidden)')) : $nodeContainer.siblings();
            $nodeContainer.closest('.nodes').prev().children(':not(.hidden)')
                .slice(1, direction ? $siblings.length * 2 + 1 : -1).addClass('hidden');
            $animatedNodes.removeClass('slide');
            $siblings.find('.node:visible:gt(0)').removeClass('slide-left slide-right').addClass('slide-up')
                .end().find('.lines, .nodes').addClass('hidden')
                .end().addClass('hidden');
            if (isInAction($node)) {
                switchHorizontalArrow($node);
            }
        });
    }

    // show the sibling nodes of the specified node
    function showSiblings($node, direction) {
        // firstly, show the sibling td tags
        var $siblings = $();
        if (direction) {
            if (direction === 'left') {
                $siblings = $node.closest('table').parent().prevAll().removeClass('hidden');
            } else {
                $siblings = $node.closest('table').parent().nextAll().removeClass('hidden');
            }
        } else {
            $siblings = $node.closest('table').parent().siblings().removeClass('hidden');
        }
        // secondly, show the lines
        var $upperLevel = $node.closest('table').closest('tr').siblings();
        if (direction) {
            $upperLevel.eq(2).children('.hidden').slice(0, $siblings.length * 2).removeClass('hidden');
        } else {
            $upperLevel.eq(2).children('.hidden').removeClass('hidden');
        }
        // thirdly, do some cleaning stuff
        if (!getNodeState($node, 'parent').visible) {
            $upperLevel.removeClass('hidden');
            var parent = $upperLevel.find('.node')[0];
            repaint(parent);
            $(parent).addClass('slide').removeClass('slide-down').one('transitionend', function() {
                $(this).removeClass('slide');
            });
        }
        // lastly, show the sibling nodes with animation
        $siblings.find('.node:visible').addClass('slide').removeClass('slide-left slide-right').eq(-1).one('transitionend', function() {
            $siblings.find('.node:visible').removeClass('slide');
            if (isInAction($node)) {
                switchHorizontalArrow($node);
                $node.children('.topEdge').removeClass('fa-chevron-up').addClass('fa-chevron-down');
            }
        });
    }

    // start up loading status for requesting new nodes
    function startLoading($arrow, $node, options) {
        var $chart = $node.closest('.orgchart');
        if (typeof $chart.data('inAjax') !== 'undefined' && $chart.data('inAjax') === true) {
            return false;
        }

        $arrow.addClass('hidden');
        $node.append('<i class="fa fa-circle-o-notch fa-spin spinner"></i>');
        $node.children().not('.spinner').css('opacity', 0.2);
        $chart.data('inAjax', true);
        $('.oc-export-btn' + (options.chartClass !== '' ? '.' + options.chartClass : '')).prop('disabled', true);
        return true;
    }

    // terminate loading status for requesting new nodes
    function endLoading($arrow, $node, options) {
        var $chart = $node.closest('div.orgchart');
        $arrow.removeClass('hidden');
        $node.find('.spinner').remove();
        $node.children().removeAttr('style');
        $chart.data('inAjax', false);
        $('.oc-export-btn' + (options.chartClass !== '' ? '.' + options.chartClass : '')).prop('disabled', false);
    }

    // whether the cursor is hovering over the node
    function isInAction($node) {
        return $node.children('.edge').attr('class').indexOf('fa-') > -1 ? true : false;
    }

    function switchVerticalArrow($arrow) {
        $arrow.toggleClass('fa-chevron-up').toggleClass('fa-chevron-down');
    }

    function switchHorizontalArrow($node) {
        var opts = $node.closest('.orgchart').data('options');
        if (opts.toggleSiblingsResp && (typeof opts.ajaxURL === 'undefined' || $node.closest('.nodes').data('siblingsLoaded'))) {
            var $prevSib = $node.closest('table').parent().prev();
            if ($prevSib.length) {
                if ($prevSib.is('.hidden')) {
                    $node.children('.leftEdge').addClass('fa-chevron-left').removeClass('fa-chevron-right');
                } else {
                    $node.children('.leftEdge').addClass('fa-chevron-right').removeClass('fa-chevron-left');
                }
            }
            var $nextSib = $node.closest('table').parent().next();
            if ($nextSib.length) {
                if ($nextSib.is('.hidden')) {
                    $node.children('.rightEdge').addClass('fa-chevron-right').removeClass('fa-chevron-left');
                } else {
                    $node.children('.rightEdge').addClass('fa-chevron-left').removeClass('fa-chevron-right');
                }
            }
        } else {
            var $sibs = $node.closest('table').parent().siblings();
            var sibsVisible = $sibs.length ? !$sibs.is('.hidden') : false;
            $node.children('.leftEdge').toggleClass('fa-chevron-right', sibsVisible).toggleClass('fa-chevron-left', !sibsVisible);
            $node.children('.rightEdge').toggleClass('fa-chevron-left', sibsVisible).toggleClass('fa-chevron-right', !sibsVisible);
        }
    }

    function repaint(node) {
        node.style.offsetWidth = node.offsetWidth;
    }

    // create node
    function createNode(nodeData, level, opts) {
        var dtd = $.Deferred();
        // construct the content of node
        var $nodeDiv = $('<div' + (opts.draggable ? ' draggable="true"' : '') + (nodeData[opts.nodeId] ? ' id="' + nodeData[opts.nodeId] + '"' : '') + '>')
            .addClass('node ' + (nodeData.className || '') +  (level >= opts.depth ? ' slide-up' : ''))
            .append('<div class="title">' + nodeData[opts.nodeTitle] + '</div>')
            .append(typeof opts.nodeContent !== 'undefined' ? '<div class="content">' + (nodeData[opts.nodeContent] || '') + '</div>' : '');
        // append 4 direction arrows
        var flags = nodeData.relationship || '';
        if (Number(flags.substr(0,1))) {
            $nodeDiv.append('<i class="edge verticalEdge topEdge fa"></i>');
        }
        if(Number(flags.substr(1,1))) {
            $nodeDiv.append('<i class="edge horizontalEdge rightEdge fa"></i>' +
                '<i class="edge horizontalEdge leftEdge fa"></i>');
        }
        if(Number(flags.substr(2,1))) {
            $nodeDiv.append('<i class="edge verticalEdge bottomEdge fa"></i>')
                .children('.title').prepend('<i class="fa '+ opts.parentNodeSymbol + ' symbol"></i>');
        }

        $nodeDiv.on('mouseenter mouseleave', function(event) {
            var $node = $(this), flag = false;
            var $topEdge = $node.children('.topEdge');
            var $rightEdge = $node.children('.rightEdge');
            var $bottomEdge = $node.children('.bottomEdge');
            var $leftEdge = $node.children('.leftEdge');
            if (event.type === 'mouseenter') {
                if ($topEdge.length) {
                    flag = getNodeState($node, 'parent').visible;
                    $topEdge.toggleClass('fa-chevron-up', !flag).toggleClass('fa-chevron-down', flag);
                }
                if ($bottomEdge.length) {
                    flag = getNodeState($node, 'children').visible;
                    $bottomEdge.toggleClass('fa-chevron-down', !flag).toggleClass('fa-chevron-up', flag);
                }
                if ($leftEdge.length) {
                    switchHorizontalArrow($node);
                }
            } else {
                $node.children('.edge').removeClass('fa-chevron-up fa-chevron-down fa-chevron-right fa-chevron-left');
            }
        });

        // define click event handler
        $nodeDiv.on('click', function(event) {
            $(this).closest('.orgchart').find('.focused').removeClass('focused');
            $(this).addClass('focused');
        });

        // define click event handler for the top edge
        $nodeDiv.on('click', '.topEdge', function(event) {
            var $that = $(this);
            var $node = $that.parent();
            var parentState = getNodeState($node, 'parent');
            if (parentState.exist) {
                var $parent = $node.closest('table').closest('tr').siblings(':first').find('.node');
                if ($parent.is('.slide')) { return; }
                // hide the ancestor nodes and sibling nodes of the specified node
                if (parentState.visible) {
                    hideAncestorsSiblings($node);
                    $parent.one('transitionend', function() {
                        if (isInAction($node)) {
                            switchVerticalArrow($that);
                            switchHorizontalArrow($node);
                        }
                    });
                } else { // show the ancestors and siblings
                    showParent($node);
                }
            } else {
                // load the new parent node of the specified node by ajax request
                var nodeId = $that.parent()[0].id;
                // start up loading status
                if (startLoading($that, $node, opts)) {
                    // load new nodes
                    $.ajax({ 'url': opts.ajaxURL.parent + nodeId + '/', 'dataType': 'json' })
                        .done(function(data) {
                            if ($node.closest('.orgchart').data('inAjax')) {
                                if (!$.isEmptyObject(data)) {
                                    addParent.call($node.closest('.orgchart').parent(), $node, data, opts);
                                }
                            }
                        })
                        .fail(function() { console.log('Failed to get parent node data'); })
                        .always(function() { endLoading($that, $node, opts); });
                }
            }
        });

        // bind click event handler for the bottom edge
        $nodeDiv.on('click', '.bottomEdge', function(event) {
            var $that = $(this);
            var $node = $that.parent();
            var childrenState = getNodeState($node, 'children');
            if (childrenState.exist) {
                var $children = $node.closest('tr').siblings(':last');
                if ($children.find('.node:visible').is('.slide')) { return; }
                // hide the descendant nodes of the specified node
                if (childrenState.visible) {
                    hideDescendants($node);
                } else { // show the descendants
                    showDescendants($node);
                }
            } else { // load the new children nodes of the specified node by ajax request
                var nodeId = $that.parent()[0].id;
                if (startLoading($that, $node, opts)) {
                    $.ajax({ 'url': opts.ajaxURL.children + nodeId + '/', 'dataType': 'json' })
                        .done(function(data, textStatus, jqXHR) {
                            if ($node.closest('.orgchart').data('inAjax')) {
                                if (data.children.length) {
                                    addChildren($node, data, $.extend({}, opts, { depth: 0 }));
                                }
                            }
                        })
                        .fail(function(jqXHR, textStatus, errorThrown) {
                            console.log('Failed to get children nodes data');
                        })
                        .always(function() {
                            endLoading($that, $node, opts);
                        });
                }
            }
        });

        // bind click event handler for the left and right edges
        $nodeDiv.on('click', '.leftEdge, .rightEdge', function(event) {
            var $that = $(this);
            var $node = $that.parent();
            var siblingsState = getNodeState($node, 'siblings');
            if (siblingsState.exist) {
                var $siblings = $node.closest('table').parent().siblings();
                if ($siblings.find('.node:visible').is('.slide')) { return; }
                if (opts.toggleSiblingsResp) {
                    var $prevSib = $node.closest('table').parent().prev();
                    var $nextSib = $node.closest('table').parent().next();
                    if ($that.is('.leftEdge')) {
                        if ($prevSib.is('.hidden')) {
                            showSiblings($node, 'left');
                        } else {
                            hideSiblings($node, 'left');
                        }
                    } else {
                        if ($nextSib.is('.hidden')) {
                            showSiblings($node, 'right');
                        } else {
                            hideSiblings($node, 'right');
                        }
                    }
                } else {
                    if (siblingsState.visible) {
                        hideSiblings($node);
                    } else {
                        showSiblings($node);
                    }
                }
            } else {
                // load the new sibling nodes of the specified node by ajax request
                var nodeId = $that.parent()[0].id;
                var url = (getNodeState($node, 'parent').exist) ? opts.ajaxURL.siblings : opts.ajaxURL.families;
                if (startLoading($that, $node, opts)) {
                    $.ajax({ 'url': url + nodeId + '/', 'dataType': 'json' })
                        .done(function(data, textStatus, jqXHR) {
                            if ($node.closest('.orgchart').data('inAjax')) {
                                if (data.siblings || data.children) {
                                    addSiblings($node, data, opts);
                                }
                            }
                        })
                        .fail(function(jqXHR, textStatus, errorThrown) {
                            console.log('Failed to get sibling nodes data');
                        })
                        .always(function() {
                            endLoading($that, $node, opts);
                        });
                }
            }
        });
        if (opts.draggable) {
            $nodeDiv.on('dragstart', function(event) {
                event.originalEvent.dataTransfer.setData('text/html', 'hack for firefox');
                var $dragged = $(this);
                var $dragZone = $dragged.closest('.nodes').siblings().eq(0).find('.node:first');
                var $dragHier = $dragged.closest('table').find('.node');
                $dragged.closest('.orgchart')
                    .data('dragged', $dragged)
                    .find('.node').each(function(index, node) {
                    if ($dragHier.index(node) === -1) {
                        if (opts.dropCriteria) {
                            if (opts.dropCriteria($dragged, $dragZone, $(node))) {
                                $(node).addClass('allowedDrop');
                            }
                        } else {
                            $(node).addClass('allowedDrop');
                        }
                    }
                });
            })
                .on('dragover', function(event) {
                    event.preventDefault();
                    var $dropZone = $(this);
                    var $dragged = $dropZone.closest('.orgchart').data('dragged');
                    var $dragZone = $dragged.closest('.nodes').siblings().eq(0).find('.node:first');
                    if ($dragged.closest('table').find('.node').index($dropZone) > -1 ||
                        (opts.dropCriteria && !opts.dropCriteria($dragged, $dragZone, $dropZone))) {
                        event.originalEvent.dataTransfer.dropEffect = 'none';
                    }
                })
                .on('dragend', function(event) {
                    $(this).closest('.orgchart').find('.allowedDrop').removeClass('allowedDrop');
                })
                .on('drop', function(event) {
                    var $dropZone = $(this);
                    var $orgchart = $dropZone.closest('.orgchart');
                    var $dragged = $orgchart.data('dragged');
                    $orgchart.find('.allowedDrop').removeClass('allowedDrop');
                    var $dragZone = $dragged.closest('.nodes').siblings().eq(0).children();
                    // firstly, deal with the hierarchy of drop zone
                    if (!$dropZone.closest('tr').siblings().length) { // if the drop zone is a leaf node
                        $dropZone.append('<i class="edge verticalEdge bottomEdge fa"></i>')
                            .parent().attr('colspan', 2)
                            .parent().after('<tr class="lines"><td colspan="2"><div class="down"></div></td></tr>'
                            + '<tr class="lines"><td class="right">&nbsp;</td><td class="left">&nbsp;</td></tr>'
                            + '<tr class="nodes"></tr>')
                            .siblings(':last').append($dragged.find('.horizontalEdge').remove().end().closest('table').parent());
                    } else {
                        var dropColspan = parseInt($dropZone.parent().attr('colspan')) + 2;
                        var horizontalEdges = '<i class="edge horizontalEdge rightEdge fa"></i><i class="edge horizontalEdge leftEdge fa"></i>';
                        $dropZone.closest('tr').next().addBack().children().attr('colspan', dropColspan);
                        if (!$dragged.find('.horizontalEdge').length) {
                            $dragged.append(horizontalEdges);
                        }
                        $dropZone.closest('tr').siblings().eq(1).children(':last').before('<td class="left top">&nbsp;</td><td class="right top">&nbsp;</td>')
                            .end().next().append($dragged.closest('table').parent());
                        var $dropSibs = $dragged.closest('table').parent().siblings().find('.node:first');
                        if ($dropSibs.length === 1) {
                            $dropSibs.append(horizontalEdges);
                        }
                    }
                    // secondly, deal with the hierarchy of dragged node
                    var dragColspan = parseInt($dragZone.attr('colspan'));
                    if (dragColspan > 2) {
                        $dragZone.attr('colspan', dragColspan - 2)
                            .parent().next().children().attr('colspan', dragColspan - 2)
                            .end().next().children().slice(1, 3).remove();
                        var $dragSibs = $dragZone.parent().siblings('.nodes').children().find('.node:first');
                        if ($dragSibs.length ===1) {
                            $dragSibs.find('.horizontalEdge').remove();
                        }
                    } else {
                        $dragZone.removeAttr('colspan')
                            .find('.bottomEdge').remove()
                            .end().end().siblings().remove();
                    }
                    $orgchart.triggerHandler({ 'type': 'nodedropped.orgchart', 'draggedNode': $dragged, 'dragZone': $dragZone.children(), 'dropZone': $dropZone });
                });
        }
        // allow user to append dom modification after finishing node create of orgchart
        if (opts.createNode) {
            opts.createNode($nodeDiv, nodeData);
        }
        dtd.resolve($nodeDiv);
        return dtd.promise();
    }
    // recursively build the tree
    function buildHierarchy ($appendTo, nodeData, level, opts, callback) {
        var $table;
        // Construct the node
        var $childNodes = nodeData[opts.nodeChildren];
        var hasChildren = $childNodes ? $childNodes.length : false;
        if (Object.keys(nodeData).length > 1) { // if nodeData has nested structure
            $table = $('<table>');
            $appendTo.append($table);
            $.when(createNode(nodeData, level, opts))
                .done(function($nodeDiv) {
                    $table.append($nodeDiv.wrap('<tr><td' + (hasChildren ? ' colspan="' + $childNodes.length * 2 + '"' : '') + '></td></tr>').closest('tr'));
                    if (callback) {
                        callback();
                    }
                })
                .fail(function() {
                    console.log('Failed to creat node')
                });
        }
        // Construct the inferior nodes and connectiong lines
        if (hasChildren) {
            if (Object.keys(nodeData).length === 1) { // if nodeData is just an array
                $table = $appendTo;
            }
            var isHidden = level + 1 >= opts.depth ? ' hidden' : '';
            // draw the line close to parent node
            $table.append('<tr class="lines' + isHidden + '"><td colspan="' + $childNodes.length * 2 + '"><div class="down"></div></td></tr>');
            // draw the lines close to children nodes
            var linesRow = '<tr class="lines' + isHidden + '"><td class="right">&nbsp;</td>';
            for (var i=1; i<$childNodes.length; i++) {
                linesRow += '<td class="left top">&nbsp;</td><td class="right top">&nbsp;</td>';
            }
            linesRow += '<td class="left">&nbsp;</td></tr>';
            $table.append(linesRow);
            // recurse through children nodes
            var $childNodesRow = $('<tr class="nodes' + isHidden + '">');
            $table.append($childNodesRow);
            $.each($childNodes, function() {
                var $td = $('<td colspan="2">');
                $childNodesRow.append($td);
                buildHierarchy($td, this, level + 1, opts, callback);
            });
        }
    }

    // build the child nodes of specific node
    function buildChildNode ($appendTo, nodeData, opts, callback) {
        var opts = opts || $appendTo.closest('.orgchart').data('options');
        var data = nodeData.children || nodeData.siblings;
        $appendTo.find('td:first').attr('colspan', data.length * 2);
        buildHierarchy($appendTo, { 'children': data }, 0, opts, callback);
    }
    // exposed method
    function addChildren($node, data, opts) {
        var count = 0;
        buildChildNode.call($node.closest('.orgchart').parent(), $node.closest('table'), data, opts, function() {
            if (++count === data.children.length) {
                if (!$node.children('.bottomEdge').length) {
                    $node.append('<i class="edge verticalEdge bottomEdge fa"></i>');
                }
                if (!$node.find('.symbol').length) {
                    $node.children('.title').prepend('<i class="fa '+ opts.parentNodeSymbol + ' symbol"></i>');
                }
                showDescendants($node);
            }
        });
    }

    // build the parent node of specific node
    function buildParentNode($currentRoot, nodeData, opts, callback) {
        var that = this;
        var $table = $('<table>');
        nodeData.relationship = '001';
        $.when(createNode(nodeData, 0, opts || $currentRoot.closest('.orgchart').data('options')))
            .done(function($nodeDiv) {
                $table.append($nodeDiv.removeClass('slide-up').addClass('slide-down').wrap('<tr class="hidden"><td colspan="2"></td></tr>').closest('tr'));
                $table.append('<tr class="lines hidden"><td colspan="2"><div class="down"></div></td></tr>');
                var linesRow = '<td class="right">&nbsp;</td><td class="left">&nbsp;</td>';
                $table.append('<tr class="lines hidden">' + linesRow + '</tr>');
                var oc = that.children('.orgchart');
                oc.prepend($table)
                    .children('table:first').append('<tr class="nodes"><td colspan="2"></td></tr>')
                    .children().children('tr:last').children().append(oc.children('table').last());
                callback();
            })
            .fail(function() {
                console.log('Failed to create parent node');
            });
    }

    // exposed method
    function addParent($currentRoot, data, opts) {
        buildParentNode.call(this, $currentRoot, data, opts, function() {
            if (!$currentRoot.children('.topEdge').length) {
                $currentRoot.children('.title').after('<i class="edge verticalEdge topEdge fa"></i>');
            }
            showParent($currentRoot);
        });
    }

    // subsequent processing of build sibling nodes
    function complementLine($oneSibling, siblingCount, existingSibligCount) {
        var lines = '';
        for (var i = 0; i < existingSibligCount; i++) {
            lines += '<td class="left top">&nbsp;</td><td class="right top">&nbsp;</td>';
        }
        $oneSibling.parent().prevAll('tr:gt(0)').children().attr('colspan', siblingCount * 2)
            .end().next().children(':first').after(lines);
    }

    // build the sibling nodes of specific node
    function buildSiblingNode($nodeChart, nodeData, opts, callback) {
        var opts = opts || $nodeChart.closest('.orgchart').data('options');
        var newSiblingCount = nodeData.siblings ? nodeData.siblings.length : nodeData.children.length;
        var existingSibligCount = $nodeChart.parent().is('td') ? $nodeChart.closest('tr').children().length : 1;
        var siblingCount = existingSibligCount + newSiblingCount;
        var insertPostion = (siblingCount > 1) ? Math.floor(siblingCount/2 - 1) : 0;
        // just build the sibling nodes for the specific node
        if ($nodeChart.parent().is('td')) {
            var $parent = $nodeChart.closest('tr').prevAll('tr:last');
            $nodeChart.closest('tr').prevAll('tr:lt(2)').remove();
            var childCount = 0;
            buildChildNode.call($nodeChart.closest('.orgchart').parent(),$nodeChart.parent().closest('table'), nodeData, opts, function() {
                if (++childCount === newSiblingCount) {
                    var $siblingTds = $nodeChart.parent().closest('table').children().children('tr:last').children('td');
                    if (existingSibligCount > 1) {
                        complementLine($siblingTds.eq(0).before($nodeChart.closest('td').siblings().andSelf().unwrap()), siblingCount, existingSibligCount);
                        $siblingTds.addClass('hidden').find('.node').addClass('slide-left');
                    } else {
                        complementLine($siblingTds.eq(insertPostion).after($nodeChart.closest('td').unwrap()), siblingCount, 1);
                        $siblingTds.not(':eq(' + insertPostion + 1 + ')').addClass('hidden')
                            .slice(0, insertPostion).find('.node').addClass('slide-right')
                            .end().end().slice(insertPostion).find('.node').addClass('slide-left');
                    }
                    callback();
                }
            });
        } else { // build the sibling nodes and parent node for the specific ndoe
            var nodeCount = 0;
            buildHierarchy($nodeChart.closest('.orgchart'), nodeData, 0, opts, function() {
                if (++nodeCount === siblingCount) {
                    complementLine($nodeChart.next().children().children('tr:last')
                        .children().eq(insertPostion).after($('<td colspan="2">')
                            .append($nodeChart)), siblingCount, 1);
                    $nodeChart.closest('tr').siblings().eq(0).addClass('hidden').find('.node').addClass('slide-down');
                    $nodeChart.parent().siblings().addClass('hidden')
                        .slice(0, insertPostion).find('.node').addClass('slide-right')
                        .end().end().slice(insertPostion).find('.node').addClass('slide-left');
                    callback();
                }
            });
        }
    }

    function addSiblings($node, data, opts) {
        buildSiblingNode.call($node.closest('.orgchart').parent(), $node.closest('table'), data, opts, function() {
            $node.closest('.nodes').data('siblingsLoaded', true);
            if (!$node.children('.leftEdge').length) {
                $node.children('.topEdge').after('<i class="edge horizontalEdge rightEdge fa"></i><i class="edge horizontalEdge leftEdge fa"></i>');
            }
            showSiblings($node);
        });
    }

    function removeNodes($node) {
        var $parent = $node.closest('table').parent();
        var $sibs = $parent.parent().siblings();
        if ($parent.is('td')) {
            if (getNodeState($node, 'siblings').exist) {
                $sibs.eq(2).children('.top:lt(2)').remove();
                $sibs.eq(':lt(2)').children().attr('colspan', $sibs.eq(2).children().length);
                $parent.remove();
            } else {
                $sibs.eq(0).children().removeAttr('colspan')
                    .find('.bottomEdge').remove()
                    .end().end().siblings().remove();
            }
        } else {
            $parent.add($parent.siblings()).remove();
        }
    }

}));
